Her parents were Maria and Bernard Szapiro. Her father was a member of
PPS Lewica, a socialist party, as well as an uncle of the writer
Stefan Kisielewski. In 1931 they moved to Warsaw, where Hanna finished school and studied law. In 1935 she became an activist of the
Związek Niezależnej Młodzieży Socjalistycznej „Życie” (Union of Independent Socialist Youth). In the first days of the Nazi occupation, Sawicka organised help for political prisoners and published the first underground publication entitled
Wolność (Freedom). In the underground resistance, Sawicka was first involved with the youth group
Spartakus, which had been organised before the war by socialists. In 1940, this group was dissolved due to ideological conflict and irreconcilable differences on the issue of fighting against Hitler while Stalin was collaborating with him. Sawicka was the co-leader of the communist publications
Biuletyn Radiowy (Radio Biuletin), which from June 1941 printed communiques of Stalinist propaganda taken from Moscow radios. In addition, she provided aid for those in the ghettos, which she and her father managed to avoid and initiated a Committee for Aid for Victims of Fascism. In February 1943, she became the editor and writer of a new communist conspiratorial paper,
Walka Młodych (The Fight of the Youth), later treated as equivalent to the leadership of the then not existing
Union of Youth Struggle, which was only formed in July 1943. Under the occupation, the Union of Youth Struggle was chiefly responsible for propaganda in the paper
Walka Młodych based in the Warsaw area. Its editing team was composed of Hanka Sawicka,
Janek Krasicki, Aleksander Kowalski, Zofia Jaroszewicz, Zofia Jaworska and Helena Kozłowska. On 18 March 1943, she was to meet with Jan Strzeszewski 'Wiktor', the commander of the Warsaw area
Gwardia Ludowa, the chief communist underground, and with Tadeusz Olszewski, 'Zawisza', the commander of its armed wing. They were arrested by Gestapo, as a result of which Olszewski was shot dead, and Strzeszewski and Sawicka were wounded and arrested. She was taken to
Serbia Prison, Pawiak, where she died in the night. ==Commemoration==